Morphs sub box--how does it work with cocoa mats? Options

[computers4kids]

I'm wrestling over where to put a sub in my car. I would like to put it in a morph sub kit and have it hidden with my cocoa mats. Either way the mats would completely cover the speaker grill.

Is this a waste of time, in other words will those heavy mats just muffle out the base?

My top three choices are:
Morph sub kit
The small powered sub self contained closure that could slip behind the seats or upside down under the steering column (under dash above pedals)
Recessed in backpad (I would hate to cut a hole in my back wall though)
Thanks, Mark

[BigDBass]

As others have said, bass won't be overly affected. I have Morph's sub in my footwell with stock carpet plus a pretty damn heavy and plush floor mat/carpet over it. I am picky about bass (the Bass in my screen name is for the low frequencies in question here, not the fish..) and I am quite satisfied with the audio in my car. Even covered with the mats, I hear bass response at reasonable volumes with the engine wailing and the top off.